/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce::dsp
{

#if JUCE_USE_SIMD
template <typename SampleType>
String& operator<< (String& str, SIMDRegister<SampleType>) { return str; }
#endif

template <typename SampleType>
class AudioBlockUnitTests final : public UnitTest
{
public:
    //==============================================================================
    using NumericType = typename SampleTypeHelpers::ElementType<SampleType>::Type;

    AudioBlockUnitTests()
        : UnitTest ("AudioBlock", UnitTestCategories::dsp)
    {
        for (auto v : { &data, &otherData })
            for (auto& channel : *v)
                channel = allocateAlignedMemory (numSamples);

        block      = { data.data(),      data.size(),      (size_t) numSamples };
        otherBlock = { otherData.data(), otherData.size(), (size_t) numSamples };

        resetBlocks();
    }

    ~AudioBlockUnitTests() override
    {
        for (auto v : { &data, &otherData })
            for (auto channel : *v)
                deallocateAlignedMemory (channel);
    }

    void runTest() override
    {
        beginTest ("Equality");
        {
            expect (block == block);
            expect (block != otherBlock);
        }

        beginTest ("Constructors");
        {
            expect (block == AudioBlock<SampleType> (data.data(), data.size(), numSamples));
            expect (block == AudioBlock<SampleType> (data.data(), data.size(), (size_t) 0, numSamples));
            expect (block == AudioBlock<SampleType> (block));

            expect (block == AudioBlock<const SampleType> (data.data(), data.size(), numSamples));
            expect (block == AudioBlock<const SampleType> (data.data(), data.size(), (size_t) 0, numSamples));
            expect (block == AudioBlock<const SampleType> (block));
        }

        beginTest ("Swap");
        {
            resetBlocks();

            expect (block != otherBlock);
            expectEquals (block.getSample (0, 0), SampleType (1.0));
            expectEquals (block.getSample (0, 4), SampleType (5.0));
            expectEquals (otherBlock.getSample (0, 0), SampleType (-1.0));
            expectEquals (otherBlock.getSample (0, 3), SampleType (-4.0));

            block.swap (otherBlock);

            expect (block != otherBlock);
            expectEquals (otherBlock.getSample (0, 0), SampleType (1.0));
            expectEquals (otherBlock.getSample (0, 4), SampleType (5.0));
            expectEquals (block.getSample (0, 0), SampleType (-1.0));
            expectEquals (block.getSample (0, 3), SampleType (-4.0));

            block.swap (otherBlock);

            expectEquals (block.getSample (0, 0), SampleType (1.0));
            expectEquals (block.getSample (0, 4), SampleType (5.0));
            expectEquals (otherBlock.getSample (0, 0), SampleType (-1.0));
            expectEquals (otherBlock.getSample (0, 3), SampleType (-4.0));
        }

        beginTest ("Getters and setters");
        {
            resetBlocks();

            expectEquals ((int) block.getNumChannels(), (int) data.size());
            expectEquals ((int) block.getNumSamples(), numSamples);

            expectEquals (block.getChannelPointer (0)[2], SampleType (3.0));
            block.getChannelPointer (0)[2] = SampleType (999.0);
            expectEquals (block.getChannelPointer (0)[2], SampleType (999.0));

            expectEquals (block.getSample (0, 4), SampleType (5.0));
            expectEquals (block.getSample (1, 4), SampleType (11.0));

            expectEquals (block.getSingleChannelBlock (1).getSample (0, 3), block.getSample (1, 3));

            expectEquals (block.getSubsetChannelBlock (0, 2).getSample (1, 3), block.getSample (1, 3));
            expectEquals (block.getSubsetChannelBlock (1, 1).getSample (0, 3), block.getSample (1, 3));

            block.setSample (1, 1, SampleType (777.0));
            expectEquals (block.getSample (1, 1), SampleType (777.0));

            block.addSample (1, 1, SampleType (1.0));
            expectEquals (block.getSample (1, 1), SampleType (778.0));
        }

        beginTest ("Basic copying");
        {
            block.clear();
            expectEquals (block.getSample (0, 2), SampleType (0.0));
            expectEquals (block.getSample (1, 4), SampleType (0.0));

            block.fill ((NumericType) 456.0);
            expectEquals (block.getSample (0, 2), SampleType (456.0));
            expectEquals (block.getSample (1, 4), SampleType (456.0));

            block.copyFrom (otherBlock);
            expect (block != otherBlock);
            expectEquals (block.getSample (0, 2), otherBlock.getSample (0, 2));
            expectEquals (block.getSample (1, 4), otherBlock.getSample (1, 4));

            resetBlocks();

            SampleType testSample1 = block.getSample (0, 2);
            SampleType testSample2 = block.getSample (1, 3);
            expectNotEquals (testSample1, block.getSample (0, 4));
            expectNotEquals (testSample2, block.getSample (1, 5));
            block.move (0, 2);
            expectEquals (block.getSample (0, 4), testSample1);
            expectEquals (block.getSample (1, 5), testSample2);
        }

        beginTest ("Addition");
        {
            resetBlocks();

            block.add ((NumericType) 15.0);
            expectEquals (block.getSample (0, 4), SampleType (20.0));
            expectEquals (block.getSample (1, 4), SampleType (26.0));

            block.add (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (15.0));
            expectEquals (block.getSample (1, 4), SampleType (15.0));

            block.replaceWithSumOf (otherBlock, (NumericType) 9.0);
            expectEquals (block.getSample (0, 4), SampleType (4.0));
            expectEquals (block.getSample (1, 4), SampleType (-2.0));

            resetBlocks();

            block.replaceWithSumOf (block, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (0.0));
            expectEquals (block.getSample (1, 4), SampleType (0.0));
        }

        beginTest ("Subtraction");
        {
            resetBlocks();

            block.subtract ((NumericType) 15.0);
            expectEquals (block.getSample (0, 4), SampleType (-10.0));
            expectEquals (block.getSample (1, 4), SampleType (-4.0));

            block.subtract (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (-5.0));
            expectEquals (block.getSample (1, 4), SampleType (7.0));

            block.replaceWithDifferenceOf (otherBlock, (NumericType) 9.0);
            expectEquals (block.getSample (0, 4), SampleType (-14.0));
            expectEquals (block.getSample (1, 4), SampleType (-20.0));

            resetBlocks();

            block.replaceWithDifferenceOf (block, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (10.0));
            expectEquals (block.getSample (1, 4), SampleType (22.0));
        }

        beginTest ("Multiplication");
        {
            resetBlocks();

            block.multiplyBy ((NumericType) 10.0);
            expectEquals (block.getSample (0, 4), SampleType (50.0));
            expectEquals (block.getSample (1, 4), SampleType (110.0));

            block.multiplyBy (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (-250.0));
            expectEquals (block.getSample (1, 4), SampleType (-1210.0));

            block.replaceWithProductOf (otherBlock, (NumericType) 3.0);
            expectEquals (block.getSample (0, 4), SampleType (-15.0));
            expectEquals (block.getSample (1, 4), SampleType (-33.0));

            resetBlocks();

            block.replaceWithProductOf (block, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (-25.0));
            expectEquals (block.getSample (1, 4), SampleType (-121.0));
        }

        beginTest ("Multiply add");
        {
            resetBlocks();

            block.addProductOf (otherBlock, (NumericType) -1.0);
            expectEquals (block.getSample (0, 4), SampleType (10.0));
            expectEquals (block.getSample (1, 4), SampleType (22.0));

            block.addProductOf (otherBlock, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (35.0));
            expectEquals (block.getSample (1, 4), SampleType (143.0));
        }

        beginTest ("Negative abs min max");
        {
            resetBlocks();
            otherBlock.negate();

            block.add (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (10.0));
            expectEquals (block.getSample (1, 4), SampleType (22.0));

            block.replaceWithNegativeOf (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (-5.0));
            expectEquals (block.getSample (1, 4), SampleType (-11.0));

            block.clear();
            otherBlock.negate();
            block.replaceWithAbsoluteValueOf (otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (5.0));
            expectEquals (block.getSample (1, 4), SampleType (11.0));

            resetBlocks();
            block.replaceWithMinOf (block, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (-5.0));
            expectEquals (block.getSample (1, 4), SampleType (-11.0));

            resetBlocks();
            block.replaceWithMaxOf (block, otherBlock);
            expectEquals (block.getSample (0, 4), SampleType (5.0));
            expectEquals (block.getSample (1, 4), SampleType (11.0));

            resetBlocks();
            auto range = block.findMinAndMax();
            expectEquals (SampleType (range.getStart()), SampleType (1.0));
            expectEquals (SampleType (range.getEnd()), SampleType (12.0));
        }

        beginTest ("Operators");
        {
            resetBlocks();
            block += (NumericType) 10.0;
            expectEquals (block.getSample (0, 4), SampleType (15.0));
            expectEquals (block.getSample (1, 4), SampleType (21.0));
            block += otherBlock;
            expectEquals (block.getSample (0, 4), SampleType (10.0));
            expectEquals (block.getSample (1, 4), SampleType (10.0));

            resetBlocks();
            block -= (NumericType) 10.0;
            expectEquals (block.getSample (0, 4), SampleType (-5.0));
            expectEquals (block.getSample (1, 4), SampleType (1.0));
            block -= otherBlock;
            expectEquals (block.getSample (0, 4), SampleType (0.0));
            expectEquals (block.getSample (1, 4), SampleType (12.0));

            resetBlocks();
            block *= (NumericType) 10.0;
            expectEquals (block.getSample (0, 4), SampleType (50.0));
            expectEquals (block.getSample (1, 4), SampleType (110.0));
            block *= otherBlock;
            expectEquals (block.getSample (0, 4), SampleType (-250.0));
            expectEquals (block.getSample (1, 4), SampleType (-1210.0));
        }

        beginTest ("Process");
        {
            resetBlocks();
            AudioBlock<SampleType>::process (block, otherBlock, [] (SampleType x) { return x + (NumericType) 1.0; });
            expectEquals (otherBlock.getSample (0, 4), SampleType (6.0));
            expectEquals (otherBlock.getSample (1, 4), SampleType (12.0));
        }

        beginTest ("Copying");
        {
            resetBlocks();
            copyingTests();
        }

        beginTest ("Smoothing");
        {
            resetBlocks();
            smoothedValueTests();
        }
    }

private:
    //==============================================================================
    void copyingTests()
    {
        if constexpr (std::is_scalar_v<SampleType>)
        {
            auto unchangedElement1 = block.getSample (0, 4);
            auto unchangedElement2 = block.getSample (1, 1);

            AudioBuffer<SampleType> otherBuffer (otherData.data(), (int) otherData.size(), numSamples);

            block.copyFrom (otherBuffer, 1, 2, 2);

            expectEquals (block.getSample (0, 4), unchangedElement1);
            expectEquals (block.getSample (1, 1), unchangedElement2);
            expectEquals (block.getSample (0, 2), otherBuffer.getSample (0, 1));
            expectEquals (block.getSample (1, 3), otherBuffer.getSample (1, 2));

            resetBlocks();

            unchangedElement1 = otherBuffer.getSample (0, 4);
            unchangedElement2 = otherBuffer.getSample (1, 3);

            block.copyTo (otherBuffer, 2, 1, 2);

            expectEquals (otherBuffer.getSample (0, 4), unchangedElement1);
            expectEquals (otherBuffer.getSample (1, 3), unchangedElement2);
            expectEquals (otherBuffer.getSample (0, 1), block.getSample (0, 2));
            expectEquals (otherBuffer.getSample (1, 2), block.getSample (1, 3));
        }
       #if JUCE_USE_SIMD
        else
        {
            auto numSIMDElements = SIMDRegister<NumericType>::SIMDNumElements;
            AudioBuffer<NumericType> numericData ((int) block.getNumChannels(),
                                                  (int) (block.getNumSamples() * numSIMDElements));

            for (int c = 0; c < numericData.getNumChannels(); ++c)
                std::fill_n (numericData.getWritePointer (c), numericData.getNumSamples(), (NumericType) 1.0);

            numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 0.127, (NumericType) 17.3);

            auto lastUnchangedIndexBeforeCopiedRange = (int) ((numSIMDElements * 2) - 1);
            auto firstUnchangedIndexAfterCopiedRange = (int) ((numSIMDElements * 4) + 1);
            auto unchangedElement1 = numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange);
            auto unchangedElement2 = numericData.getSample (1, firstUnchangedIndexAfterCopiedRange);

            block.copyTo (numericData, 1, 2, 2);

            expectEquals (numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange), unchangedElement1);
            expectEquals (numericData.getSample (1, firstUnchangedIndexAfterCopiedRange), unchangedElement2);
            expect (SampleType (numericData.getSample (0, 2 * (int) numSIMDElements)) == block.getSample (0, 1));
            expect (SampleType (numericData.getSample (1, 3 * (int) numSIMDElements)) == block.getSample (1, 2));

            numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 15.1, (NumericType) 0.7);

            auto unchangedSIMDElement1 = block.getSample (0, 1);
            auto unchangedSIMDElement2 = block.getSample (1, 4);

            block.copyFrom (numericData, 1, 2, 2);

            expect (block.getSample (0, 1) == unchangedSIMDElement1);
            expect (block.getSample (1, 4) == unchangedSIMDElement2);
            expectEquals (block.getSample (0, 2).get (0), numericData.getSample (0, (int) numSIMDElements));
            expectEquals (block.getSample (1, 3).get (0), numericData.getSample (1, (int) (numSIMDElements * 2)));

            if (numSIMDElements > 1)
            {
                expectEquals (block.getSample (0, 2).get (1), numericData.getSample (0, (int) (numSIMDElements + 1)));
                expectEquals (block.getSample (1, 3).get (1), numericData.getSample (1, (int) ((numSIMDElements * 2) + 1)));
            }
        }
       #endif
    }

    //==============================================================================
    void smoothedValueTests()
    {
        if constexpr (std::is_scalar_v<SampleType>)
        {
            block.fill ((SampleType) 1.0);
            SmoothedValue<SampleType> sv { (SampleType) 1.0 };
            sv.reset (1, 4);
            sv.setTargetValue ((SampleType) 0.0);

            block.multiplyBy (sv);
            expect (block.getSample (0, 2) < (SampleType) 1.0);
            expect (block.getSample (1, 2) < (SampleType) 1.0);
            expect (block.getSample (0, 2) > (SampleType) 0.0);
            expect (block.getSample (1, 2) > (SampleType) 0.0);
            expectEquals (block.getSample (0, 5), (SampleType) 0.0);
            expectEquals (block.getSample (1, 5), (SampleType) 0.0);

            sv.setCurrentAndTargetValue (-1.0f);
            sv.setTargetValue (0.0f);
            otherBlock.fill (-1.0f);
            block.replaceWithProductOf (otherBlock, sv);
            expect (block.getSample (0, 2) < (SampleType) 1.0);
            expect (block.getSample (1, 2) < (SampleType) 1.0);
            expect (block.getSample (0, 2) > (SampleType) 0.0);
            expect (block.getSample (1, 2) > (SampleType) 0.0);
            expectEquals (block.getSample (0, 5), (SampleType) 0.0);
            expectEquals (block.getSample (1, 5), (SampleType) 0.0);
        }
    }

    //==============================================================================
    void resetBlocks()
    {
        auto value = SampleType (1.0);

        for (size_t c = 0; c < block.getNumChannels(); ++c)
        {
            for (size_t i = 0; i < block.getNumSamples(); ++i)
            {
                block.setSample ((int) c, (int) i, value);
                value += SampleType (1.0);
            }
        }

        otherBlock.replaceWithNegativeOf (block);
    }

    //==============================================================================
    static SampleType* allocateAlignedMemory (int numSamplesToAllocate)
    {
        auto alignmentLowerBound = std::alignment_of_v<SampleType>;
       #if ! JUCE_WINDOWS
        alignmentLowerBound = jmax (sizeof (void*), alignmentLowerBound);
       #endif
        auto alignmentOrder = std::ceil (std::log2 (alignmentLowerBound));
        auto requiredAlignment = (size_t) std::pow (2, alignmentOrder);

        auto size = (size_t) numSamplesToAllocate * sizeof (SampleType);

       #if JUCE_WINDOWS
        auto* memory = _aligned_malloc (size, requiredAlignment);
       #else
        void* memory;
        auto result = posix_memalign (&memory, requiredAlignment, size);

        if (result != 0)
        {
            jassertfalse;
            return nullptr;
        }
       #endif

        return static_cast<SampleType*> (memory);
    }

    void deallocateAlignedMemory (void* address)
    {
       #if JUCE_WINDOWS
        _aligned_free (address);
       #else
        free (address);
       #endif
    }

    //==============================================================================
    static constexpr int numChannels = 2, numSamples = 6;
    std::array<SampleType*, numChannels> data, otherData;
    AudioBlock<SampleType> block, otherBlock;
};

static AudioBlockUnitTests<float> audioBlockFloatUnitTests;
static AudioBlockUnitTests<double> audioBlockDoubleUnitTests;

#if JUCE_USE_SIMD
static AudioBlockUnitTests<SIMDRegister<float>> audioBlockSIMDFloatUnitTests;
static AudioBlockUnitTests<SIMDRegister<double>> audioBlockSIMDDoubleUnitTests;
#endif

} // namespace juce::dsp
